Pipe Flanges

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Pipe Flange is a type of pipe connection that is commonly used to connect one pipe with another in addition to the welding connection. Flange connections are preferred for piping connection to nozzle equipment or to other components where regular maintenance is required. Piping Flange is also used for line breaks or spec. breaks.

If Elbow, Tee, Reducer, Cap are components made of the same material as the pipe material to which it will be connected, then flanges have a difference because generally flanges are made of material through the forging process, which is the process of forming metal by applying pressure. In addition, flange also undergoes a process called “machined surface”.

Flanges are usually not recommended for use in underground service for several reasons such as the possibility for corrosion of bolted connections due to the flange will be in direct contact with soil, also for maintenance purposes will be challenging. Where it is necessary and unavoidable to use a flange in underground service, such as at a valve, it is preferred to have the flanged connection exposed in a valve pit for maintenance access.

The use of pipe flanges in Oil and Gas facilities can be summarized below:

  1. At equipment nozzle
  2. At valves and at the blanks
  3. Pipe removable spool
  4. Where frequent dismantling of piping is required due to operation and maintenance purposes.
  5. To connect Piping Metallic and Non-Metallic
  6. For installation/erection purposes
  7. For maintenance cleaning, decoking, or slurry service

Flanges in sizes NPS 24 and smaller shall be in accordance with ASME B16.5 for the listed materials. Steel flanges larger than NPS 24 shall be in accordance with ASME B16.47, Series B, unless specified differently.

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